A radio frequency identification (RFID) network and methods for tracking subjects in a closed environment includes distributing RFID readers across the environment. Readers have unique reader identifiers and communicate with a computer system. These identifiers and reader locations are stored. The location of subjects bearing passive RFID tags is acquired by reading the unique subject identifiers off the tags and associating these RFID tags with the reader identifiers of the readers making the readings. A subject data store includes the location data of the subjects obtained by the RFID readers and electronic addresses of the subjects. An instruction set data store comprising sets, each set corresponding to one of a plurality of events, is also maintained. In accordance with the instruction set data store, in response to an event, different event messages are sent to different subjects based upon their location in the closed environment and/or their class label.